search for: do_softirq

__napi_schedule might raise softirq but nothing causes do_softirq to trigger, so it does not in fact run. As a result, the error message "NOHZ: local_softirq_pending 08" sometimes occurs during boot of a KVM guest when the network service is started and we are oom: ... Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determ...

__napi_schedule might raise softirq but nothing causes do_softirq to trigger, so it does not in fact run. As a result, the error message "NOHZ: local_softirq_pending 08" sometimes occurs during boot of a KVM guest when the network service is started and we are oom: ... Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determ...

...t; 0000000000000012 0000010073478680 <5> Call Trace:<IRQ> <ffffffff80138552>{printk+141} <ffffffff80112f4a>{handle_IRQ_event+41} <5> <ffffffff801131c4>{do_IRQ+197} <ffffffff80110833>{ret_from_intr+0} <5> <ffffffff8013c731>{__do_softirq+77} <ffffffff8013c7e5>{do_softirq+49} <5> <ffffffff80110bf5>{apic_timer_interrupt+133} <EOI> <ffffffff8011c21a>{flush_tlb_page+44} <5> <ffffffff80169106>{do_wp_page+1127} <ffffffff80123ed3>{do_page_fault+575} <5> <ffffff...

...ad+126/128] sys_read+0x7e/0x80 [work_resched+5/47] work_resched+0x5/0x2f scheduling while atomic [schedule+1682/1696] schedule+0x692/0x6a0 [sys_read+126/128] sys_read+0x7e/0x80 [work_resched+5/47] work_resched+0x5/0x2f scheduling while atomic [schedule+1682/1696] schedule+0x692/0x6a0 [do_softirq+155/160] do_softirq+0x9b/0xa0 [irq_exit+57/64] irq_exit+0x39/0x40 [do_IRQ+34/48] do_IRQ+0x22/0x30 [evtchn_do_upcall+190/320] evtchn_do_upcall+0xbe/0x140 [work_resched+5/47] work_resched+0x5/0x2f scheduling while atomic [schedule+1682/1696] schedule+0x692/0x6a0 [do_softirq+155/160] do_s...

...k implementation for the i386 linux portion. In implementing the hypercall, I''ve been trying to figure out how to get the scheduler (I''ve only played with bvt) to run the vcpu passed in the hypercall (after some validation) but I''ve run into various bad state situations (do_softirq pending != 0 assert, ''!active_ac_timer(timer)'' failed , and __task_on_runqueue(prev) failed) which tells me I don''t fully understand all of the book-keeping that is needed. Has anyone thought about how to do this with either BVT or the new EDF scheduler? -- Ryan Harper...

...e_skb+333/538] netif_receive_skb+0x14d/0x21a Dec 8 12:19:26 server kernel: [tg3_rx+732/957] tg3_rx+0x2dc/0x3bd Dec 8 12:19:26 server kernel: [tg3_poll+119/356] tg3_poll+0x77/0x164 Dec 8 12:19:26 server kernel: [net_rx_action+164/368] net_rx_action+0xa4/0x170 Dec 8 12:19:27 server kernel: [__do_softirq+116/240] __do_softirq+0x74/0xf0 Dec 8 12:19:27 server kernel: [do_softirq+63/99] do_softirq+0x3f/0x63 Dec 8 12:19:27 server kernel: [do_IRQ+31/37] do_IRQ+0x1f/0x25 Dec 8 12:19:27 server kernel: [evtchn_do_upcall+132/192] evtchn_do_upcall+0x84/0xc0 Dec 8 12:19:27 server kernel: [hypervisor_c...

..._timer_interrupt+0x1f/0x24 [<c01c007b>] blk_do_ordered+0x70/0x27e [<c01ce788>] _raw_spin_lock+0xaa/0x13e [<f8b8b422>] htb_rate_timer+0x18/0xc4 [sch_htb] [<c0127539>] run_timer_softirq+0x163/0x189 [<f8b8b40a>] htb_rate_timer+0x0/0xc4 [sch_htb] [<c0123315>] __do_softirq+0x70/0xdb [<c01233bb>] do_softirq+0x3b/0x42 [<c0111cda>] smp_apic_timer_interrupt+0x9c/0xb2 [<c0104373>] apic_timer_interrupt+0x1f/0x24 [<c0101cc3>] mwait_idle_with_hints+0x3b/0x3f [<c0101cd3>] mwait_idle+0xc/0x1b [<c010271c>] cpu_idle+0x63/0x79 ==========...

...ure how others manage to get these typed out, but I'm manually typing it from what's on the monitor: Call Trace: <IRQ> <ffffffff802820df>{i8042_interrupt+111} <ffffffff80200080>{commit_timeout+0} <ffffffff8013f143>{run_timer_softirq+387} <ffffffff8013b111>{__do_softirq+113} <ffffffff8010ee63>{call_softirq+31} <ffffffff80110a55>{do_softirq+53} <ffffffff8010e5c8>{apic_timer_interrupt+132} <EOI> <ffffffff801fb8a6>{do_get_write_access+118} <ffffffff801fb88e>{do_get_write_access+94} <ffffffff80185d1f>{__getblk+47} <fffffff...

...6 05:12:30 kanga kernel: [<c01c0e0e>] net_tx_action [kernel] 0x8e Mar 6 05:12:30 kanga kernel: [ext3:__insmod_ext3_S.bss_L1024+163840/116200300] __insmod_wd_S.bss_L1376 [wd] 0x20 Mar 6 05:12:31 kanga kernel: [<c8842020>] __insmod_wd_S.bss_L1376 [wd] 0x20 Mar 6 05:12:31 kanga kernel: [do_softirq+83/160] do_softirq [kernel] 0x53 Mar 6 05:12:31 kanga kernel: [<c0119763>] do_softirq [kernel] 0x53 Mar 6 05:12:31 kanga kernel: [do_IRQ+156/176] do_IRQ [kernel] 0x9c Mar 6 05:12:31 kanga kernel: [<c01084cc>] do_IRQ [kernel] 0x9c Mar 6 05:12:31 kanga kernel: [call_do_IRQ+5/17] call_...

...a CPU is always a potentially "dangerous" operation, because one CPU might end up very busy while the others are mostly idle." I think in Xen, the same approach is taken from what I can tell (softirq_pending is keyed by cpu, used both in activation (cpu_raise_softirq) and execution (do_softirq)). Is there room for optimization here? I''m looking at Xen''s softirq mechanism and just noticed this, that''s all. I have no performance data or anything. In Xen, when would the hardware cache situation in the quote above generally have a real effect? Are there any pa...

...f880a57cd>] :sd_mod:sd_rw_intr+0x21d/0x257 Apr 18 01:10:00 xenmaster kernel: [<ffffffff88078565>] :scsi_mod:scsi_device_unbusy+0x67/0x81 Apr 18 01:10:00 xenmaster kernel: [<ffffffff802389b8>] blk_done_softirq+0x67/0x75 Apr 18 01:10:00 xenmaster kernel: [<ffffffff80212880>] __do_softirq+0x8d/0x13b Apr 18 01:10:00 xenmaster kernel: [<ffffffff8025fda4>] call_softirq+0x1c/0x278 Apr 18 01:10:00 xenmaster kernel: [<ffffffff8026d08e>] do_softirq+0x31/0x98 Apr 18 01:10:00 xenmaster kernel: [<ffffffff8026cf09>] do_IRQ+0xec/0xf5 Apr 18 01:10:00 xenmaster kernel: [<...

Just gave 3.0 a spin. Had been running 2.0.7 for the past 3 months or so without problems (aside from intermittent failure during live migration). Anyway, 3.0 seems to have an issue with my machine. It starts up the 4 domains that I''ve got defined (was running 6 user domains with 2.0.7, but two of those were running 2.4 kernels which I can''t seem to build with Xen 3.0 yet, and

...52a20 c034e401 c034e3a5 0000027c c034e3f8 f7b58e00 c016b5f7 f7b58e00 00001b0c d93e88e0 c0168c8d f7b58e00 f7b58ee4 00000000 00000fdc dc757024 00000002 db247c60 f28df240 f122f730 00000001 00000070 00000001 e2bc9ae0 Call Trace: [journal_next_log_block+103/112] [journal_commit_transaction+1661/3856] [do_softirq+123/224] [do_IRQ+221/240] [schedule+1113/1296] Call Trace: [<c016b5f7>] [<c0168c8d>] [<c011cdcb>] [<c01089bd>] [<c0115e59>] [kjournald+310/464] [commit_timeout+0/16] [kernel_thread+38/48] [kjournald+0/464] [<c016aff6>] [<c016aea0>] [<c0105616>] [&l...

...[<ffffffffa016887f>] ? bnx2x_rx_int+0x83f/0x1630 [bnx2x] [<ffffffff810608dc>] ? perf_event_task_sched_out+0x4c/0x70 [<ffffffffa01698ae>] ? bnx2x_poll+0x23e/0x2f0 [bnx2x] [<ffffffff8144ac93>] ? net_rx_action+0x103/0x2f0 [<ffffffff8107a811>] ? __do_softirq+0xc1/0x1e0 [<ffffffff810e6b30>] ? handle_IRQ_event+0x60/0x170 [<ffffffff8100c30c>] ? call_softirq+0x1c/0x30 [<ffffffff8100fa75>] ? do_softirq+0x65/0xa0 [<ffffffff8107a6c5>] ? irq_exit+0x85/0x90 [<ffffffff8151b165>] ? do_IRQ+0x75/0xf0 [<...

..._rcv at ffffffff81496155 #16 [ffff880028283d28] __netif_receive_skb at ffffffff8145db5b #17 [ffff880028283d88] netif_receive_skb at ffffffff814621b8 #18 [ffff880028283dc8] virtnet_poll at ffffffffa0130565 [virtio_net] #19 [ffff880028283e68] net_rx_action at ffffffff81463193 #20 [ffff880028283ec8] __do_softirq at ffffffff81078c71 #21 [ffff880028283f38] call_softirq at ffffffff8100c1cc #22 [ffff880028283f50] do_softirq at ffffffff8100de05 #23 [ffff880028283f70] irq_exit at ffffffff81078a55 #24 [ffff880028283f80] do_IRQ at ffffffff81532365 --- <IRQ stack> --- #25 [ffff88001e851f58] ret_from_intr at f...

...0/0x130 [bridge] [<c9168d59>] br_handle_frame+0x1f9/0x270 [bridge] [<c9168a30>] br_handle_frame_finish+0x0/0x130 [bridge] [<c028b894>] netif_receive_skb+0x154/0x2f0 [<c028bad6>] process_backlog+0xa6/0x160 [<c028bc15>] net_rx_action+0x85/0x140 [<c0120315>] __do_softirq+0x95/0xb0 [<c012037d>] do_softirq+0x4d/0x50 [<c010d062>] do_IRQ+0x22/0x30 [<c01048a0>] evtchn_do_upcall+0x70/0xa0 [<c0108c48>] hypervisor_callback+0x2c/0x34 [<c010482c>] force_evtchn_callback+0xc/0x10 [<c011bdde>] release_console_sem+0x5e/0xd0 [<c011bc0...

...:20:00 localhost kernel: [<ffffffff800b54bc>] __do_IRQ+0xc7/0x105 Jan 8 05:20:00 localhost kernel: [<ffffffff8006a3bd>] do_IRQ+0xe7/0xf5 Jan 8 05:20:00 localhost kernel: [<ffffffff8005b615>] ret_from_intr+0x0/0xa Jan 8 05:20:00 localhost kernel: [<ffffffff80011cba>] __do_softirq+0x53/0xd5 Jan 8 05:20:00 localhost kernel: [<ffffffff801515dd>] end_msi_irq_wo_maskbit+0x9/0x16 Jan 8 05:20:00 localhost kernel: [<ffffffff8005c2fc>] call_softirq+0x1c/0x28 Jan 8 05:20:00 localhost kernel: [<ffffffff8006a53a>] do_softirq+0x2c/0x85 Jan 8 05:20:00 localhost k...

...0 [<c0118f92>] __printk_ratelimit+0x8f/0x95 [<e08a6316>] xennet_get_responses+0xca/0x31c [xen_vnif] [<c0103dc2>] do_IRQ+0x70/0x7a [<e08a6851>] netif_poll+0x1c/0x60v [xen_vnif] [<c0103dc2>] net_rx_action+0x35/0x7d [<c011c47d>] __do_softirq+0x38/0x3f [<c0103e94>] do_softirq+0x38/0x3f ======================= [<c0103dc2>] do_IRQ+0x70/0x7a [<c0102c1a>] common_interrupt+0x27/0x2b [<c014b5d8>] kmem_cache_free+0x27/0x2b [<c013dac4>] free_pgtables+0x31/0x63 [<c01421ab...

...t;] br_handle_frame_finish+0x0/0xca [<c0356a8d>] br_handle_frame+0x168/0x1a7 [<c035685b>] br_handle_frame_finish+0x0/0xca [<c02fff45>] netif_receive_skb+0x117/0x1dc [<c0300077>] process_backlog+0x6d/0xd6 [<c030013d>] net_rx_action+0x5d/0x0xd2 [<c011a8b4>] __do_softirq+0x34/0x7d [<c011a91f>] do_softirq+0x22/0x26 [<c0104872>] do_IRQ+0x1e/0x24 [<c0103436>] common_interrupt+0x1a/0x20 [<c0101047>] default_idle+0x2b/0x53 [<c01010c2>] cpu_idle+0x3f/0x5b [<c047668c>] start_kernel+0x139/0x13b Code: 00 04 83 41 20 04 8b 41 28 51 f...

...4:21 backup03 kernel: [<ffffffff8100faf9>] ? handle_irq+0x49/0xa0 Mar 7 18:54:21 backup03 kernel: [<ffffffff81530fec>] ? do_IRQ+0x6c/0xf0 Mar 7 18:54:21 backup03 kernel: [<ffffffff8100b9d3>] ? ret_from_intr+0x0/0x11 Mar 7 18:54:21 backup03 kernel: [<ffffffff8107a893>] ? __do_softirq+0x73/0x1e0 Mar 7 18:54:21 backup03 kernel: [<ffffffff810ac9da>] ? tick_program_event+0x2a/0x30 Mar 7 18:54:21 backup03 kernel: [<ffffffff8100c30c>] ? call_softirq+0x1c/0x30 Mar 7 18:54:21 backup03 kernel: [<ffffffff8100fa75>] ? do_softirq+0x65/0xa0 Mar 7 18:54:21 backup03 kern...